The bismuth oxyhalide family: thin film synthesis and periodic properties

Abstract

Bismuth oxyhalides (BiOX, where X = F, Cl, Br, I) are interesting materials due to their layered structure, which can be useful for different applications. In this work, we present the synthesis of the complete BiOX family in the thin film form. The tetragonal phase Bi2O3 film deposited onto a glass substrate was transformed into BiOF, BiOCl or BiOBr by a simple immersion at ambient temperature in a halide (X = F, Cl, Br) containing solution. For these films, a residual phase from the oxide was present and for BiOF another phase (tentatively identified as Bi7O5F11) was present too. For the BiOI film synthesis, an iodine and bismuth containing solution was sprayed onto the glass substrate heated at 275 °C and a pure phase was obtained. Microstructural and morphological characterization was performed by X-ray diffraction and scanning electron microscopy, while the chemical environment was studied by X-ray photoelectron spectroscopy. Optical and photocatalytic properties were also obtained. The physical and chemical characteristics of the BiOX films follow a correlation with the atomic radius of the halogen atom incorporated into the corresponding lattice. All the BiOX films showed a photocatalytic response for the photodiscoloration of indigo carmine dye under simulated sunlight irradiation in an alkaline medium. The photocatalytic reactions occurred via 2 proton-electron transfer from the oxide or oxyhalide to the adsorbed IC dye, favoring its reduction to the corresponding leuco IC form.

The versatile biomedical applications of bismuth-based nanoparticles and composites: therapeutic, diagnostic, biosensing, and regenerative properties

“…57 Moreover, the relatively low price and abundancy of Bi is attractive for its large-scale applications. 58 Bulk Bi is a semimetal with large Fermi wavelengths, high magnetoresistance, and strong diamagnetism, 59 which can be used to fabricate BiNPs with different shapes and compositions. The most common ones are Bi 2 O 3 , Bi 2 S 3 , Bi 2 Se 3 , and Bi 2 Te 3 that belong to the group VI of Bi compounds, so-called Bi chalcogenides.…”

“…Due to their layered structure and high chemical stability, along with their optical, electrical, and mechanical properties, these types of materials have mainly attracted increased attention for photocatalytic activities under visible light irradiation, as well as electronics, and energy storage. 58,[62][63][64] 2 CO 3 , and BisBAL. 24,[65][66][67][68][69][70] The main characteristics, properties, and applications of the most common types of BiNPs are summarized in Table 1.…”

A novel zero valent metal bismuth for bromate removal: direct and ultraviolet enhanced reduction

“…The reason why bromide appeared in the solid surface was not only the adsorption of the double electric layer of materials but also the insolubility of bismuth oxyhalide. 27 The above analysis demonstrated the synthesized Bi sample was able for direct bromate reduction.…”

Improved Photoelectric Performance of UV Photodetector Based on ZnO Nanoparticle‐Decorated BiOCl Nanosheet Arrays onto PDMS Substrate: The Heterojunction and Ti3C2Tx MXene Conduction Layer

“…[ 1 ] They have been widely applied as photocatalysts, [ 2 ] electrocatalysts, [ 3 ] as well as electrode materials in energy storage [ 4 ] and photoelectrochemical devices, [ 5–7 ] owing to their layered structures and excellent optical, catalytic, and electrical properties. [ 8,9 ] The layered structure and the as‐induced dipole can cause the efficient separation of the electron–hole pair, which can achieve enhanced photocatalytic activity and photoconductivity. [ 10,11 ] The low‐dimensional nanostructures of bismuth oxide halides, such as nanosheets, [ 12 ] nanonetworks, [ 13 ] microspheres, [ 14 ] and nanosheet arrays, [ 15 ] have been prepared and adopted as the sensitive materials for photoelectric devices.…”